matlab的编程问题，求关于平均数，最小值，最大值，方差等简单的数据处理的程序。

如果数据都放在a.txt记事本中。
代码如下：（如果a是向量这按下面的，如果是矩阵，需算两次）
load 'a.txt'
amin=min(a);%%最小值 若为矩阵，则amin=min(min(a))
amax=max(a);%%最大值 同上
aavg=mean(a);%%平均值 同上
avar=var(a);
plot(a);

>> help stats

Descriptive Statistics.
bootci - Bootstrap confidence intervals.
bootstrp - Bootstrap statistics.
corr - Linear or rank correlation coefficient.
corrcoef - Linear correlation coefficient (in MATLAB toolbox).
cov - Covariance (in MATLAB toolbox).
crosstab - Cross tabulation.
geomean - Geometric mean.
grpstats - Summary statistics by group.
harmmean - Harmonic mean.
iqr - Interquartile range.
jackknife - Jackknife statistics.
kurtosis - Kurtosis.
mad - Median Absolute Deviation.
mean - Sample average (in MATLAB toolbox).
median - 50th percentile of a sample (in MATLAB toolbox).
mode - Mode, or most frequent value in a sample (in MATLAB toolbox).
moment - Moments of a sample.
nancov - Covariance matrix ignoring NaNs.
nanmax - Maximum ignoring NaNs.
nanmean - Mean ignoring NaNs.
nanmedian - Median ignoring NaNs.
nanmin - Minimum ignoring NaNs.
nanstd - Standard deviation ignoring NaNs.
nansum - Sum ignoring NaNs.
nanvar - Variance ignoring NaNs.
partialcorr - Linear or rank partial correlation coefficient.
prctile - Percentiles.
quantile - Quantiles.
range - Range.
skewness - Skewness.
std - Standard deviation (in MATLAB toolbox).
tabulate - Frequency table.
trimmean - Trimmed mean.
var - Variance (in MATLAB toolbox).

对于一列或一行数据x
最小值：min(x)
最大值：max(x)
均值：mean(x)
方差：var(x)
作图:plot(x)

就是一些气象数据，经济数据，粮食产量等数据求平均，最小，最大值，方差等如果数据都放在a.txt记事本中。代码如下：（如果a是向量这按下面的，如果是

我的妈啊 那么多 好头疼哦